Centre de documentation
scientifique

Dépouillements

Gravimetric and magnetic anomalies produced by dissolution-crystallization at the core-mantle boundary / Mioara Mandea in Journal of geophysical research : Solid Earth, vol 120 n° 9 (September 2015)    

Public [article]  inJournal of geophysical research : Solid Earth > vol 120 n° 9 (September 2015) . - pp 5983 - 6000 Titre : Gravimetric and magnetic anomalies produced by dissolution-crystallization at the core-mantle boundary Type de document : Article/Communication Auteurs : Mioara Mandea, Auteur ; Clément Narteau, Auteur ; Isabelle Panet , Auteur ; Jean-Louis Le Mouël, Auteur Année de publication : 2015 Article en page(s) : pp 5983 - 6000 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] anomalie de pesanteur [Termes IGN] champ de pesanteur terrestre [Termes IGN] champ géomagnétique [Termes IGN] convection [Termes IGN] manteau terrestre [Termes IGN] modèle numérique [Termes IGN] silicate Résumé : (auteur) Using the unique data sets provided by satellite observations, correlated temporal variations in gravity and magnetic fields over a large area extending from the Atlantic to the Indian Ocean have been recently reported. On a timescale of few years to a decade, both field variations may be linked to changes at the top of the core. Here we propose that in addition to the topography generated by the convection in the mantle, the core-mantle boundary (CMB) may be in a dynamic equilibrium state, mainly controlled by a dissolution-crystallization process of the mantle silicate rocks in the liquid alloy of the core. Due to the resulting continuous changes in CMB topography, anomalies of hundreds of nGal and tens of nT yr−2 might be produced by the corresponding mass redistribution and the secondary flow generated by the associated pressure field. Numerical modeling and both gravimetric and magnetic anomaly magnitudes suggest a rate of centimeters per year and a large range of length scales for the changes in the topography at the CMB. Numéro de notice : A2015--073 Affiliation des auteurs : IGN+Ext (2012-2019) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1002/2015JB012048 Date de publication en ligne : 14/09/2015 En ligne : http://dx.doi.org/10.1002/2015JB012048 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83689 [article]

Documents numériques

en open access Gravimetric and magnetic anomalies ... - pdf éditeur Adobe Acrobat PDF